package ErWeiMa; /**
 * @author ：dechang.zhang
 * @description：
 * @Date： 2018/10/18 15:48:35
 */

import com.google.zxing.*;
import com.google.zxing.client.j2se.BufferedImageLuminanceSource;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;

/**
 * @author dechang.zhang
 * @date 2018/10/18 15:48:35
 */
public class ErWeiMa {
    private static final String CHARSET = "utf-8";
    private static final String FORMAT_NAME = "JPG";
    // LOGO宽度
    private static final int WIDTH = 60;
    // LOGO高度
    private static final int HEIGHT = 60;


    /**
     * 生成二维码
     *
     * @param content      源内容
     * @param imgPath      生成二维码保存的路径
     * @param needCompress 是否要压缩
     * @return 返回二维码图片
     * @throws Exception
     */
    private static BufferedImage createImage(String content, String imgPath, boolean needCompress, int erWeiMaSize) throws Exception {
        Hashtable hints = new Hashtable();
        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
        hints.put(EncodeHintType.MARGIN, 1);
        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, erWeiMaSize, erWeiMaSize,
                hints);
        int width = bitMatrix.getWidth();
        int height = bitMatrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
            }
        }
        if (imgPath == null || "".equals(imgPath)) {
            return image;
        }
        // 插入图片
        ErWeiMa.insertImage(image, imgPath, needCompress, erWeiMaSize);
        return image;
    }

    /**
     * 在生成的二维码中插入图片
     *
     * @param source
     * @param imgPath
     * @param needCompress
     * @throws Exception
     */
    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress, int erWeiMaSize) throws Exception {
        File file = new File(imgPath);
        //System.out.println(file+"****************************");
        if (!file.exists()) {
            System.err.println("" + imgPath + "   该文件不存在！");
            return;
        }
        Image src = ImageIO.read(new File(imgPath));
        int width = src.getWidth(null);
        int height = src.getHeight(null);
        if (needCompress) { // 压缩LOGO
            if (width > WIDTH) {
                width = WIDTH;
            }
            if (height > HEIGHT) {
                height = HEIGHT;
            }
            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
            Graphics g = tag.getGraphics();
            g.drawImage(image, 0, 0, null); // 绘制缩小后的图
            g.dispose();
            src = image;
        }
        // 插入LOGO
        Graphics2D graph = source.createGraphics();
        int x = (erWeiMaSize - width) / 2;
        int y = (erWeiMaSize - height) / 2;
        graph.drawImage(src, x, y, width, height, null);
        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
        graph.setStroke(new BasicStroke(3f));
        graph.draw(shape);
        graph.dispose();
    }

    /**
     * 生成带logo二维码，并保存到磁盘
     *
     * @param content      链接或者内容
     * @param imgPath      logo图片
     * @param destPath     保存二维码图片的文件路径
     * @param needCompress
     * @throws Exception
     */
    public static Boolean encode(String content, String imgPath, String destPath, boolean needCompress, String random, int erWeiMaSize) throws Exception {
        BufferedImage image = ErWeiMa.createImage(content, imgPath, needCompress, erWeiMaSize);
        if (image == null) {
            return false;
        }
        mkdirs(destPath);
        String file = random + Math.random() + ".jpg";//生成随机文件名
        ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
        return true;
    }

    public static void mkdirs(String destPath) {
        File file = new File(destPath);
        // 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir。(mkdir如果父目录不存在则会抛出异常)
        if (!file.exists() && !file.isDirectory()) {
            file.mkdirs();
        }
    }

    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress, int erWeiMaSize)
            throws Exception {
        BufferedImage image = ErWeiMa.createImage(content, imgPath, needCompress, erWeiMaSize);
        ImageIO.write(image, FORMAT_NAME, output);
    }

    public static void encode(String content, OutputStream output, int erWeiMaSize) throws Exception {
        ErWeiMa.encode(content, null, output, false, erWeiMaSize);
    }


    /**
     * 从二维码中，解析数据
     *
     * @param file 二维码图片文件
     * @return 返回从二维码中解析到的数据值
     * @throws Exception
     */
    public static String decode(File file) throws Exception {
        BufferedImage image;
        image = ImageIO.read(file);
        if (image == null) {
            return null;
        }
        BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
        BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
        Result result;
        Hashtable hints = new Hashtable();
        hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
        result = new MultiFormatReader().decode(bitmap, hints);
        String resultStr = result.getText();
        return resultStr;
    }

    public static String decode(String path) throws Exception {
        return ErWeiMa.decode(new File(path));
    }

    public static void main(String[] args) {
        String content = "http://www.baidu.com";
        String logourl = "";
        String keepJpgPath = "C:\\Users\\ZhangDeChang\\Desktop";
        String randomName = "testE";
        // 二维码尺寸
        int erWeiMaSize = 600;
        try {
            ErWeiMa.encode(content, logourl, keepJpgPath, true, randomName, erWeiMaSize);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}
